Sewing-machine.



e. M. EAlVlES ml 8. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. 1913. 1,1 9 Patented A11 29, 1916.

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A TTOR/VEV G. M. EAIVIES & J. S. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. 1913.

WITNESSES:

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G. M. EAMES & J. S. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. I913 1 1 96.53% Patented Aug. 29, 1916.

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WITNESSES.

' 0/7/11 5 9271/6/0- v mzmwi d 2 ATTORNEY GEORGE M. EAMES AND JOHN S.FINCH, OF BRIDGEPORT, CONNECTICUT, ASSIGNORS TO THE SINGER MANUFACTURINGCOMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Aug. 231, 1916.

. To all whom it may concern:

Be it known that we, GEORGE M. EAMEs and JOHN S. F INCH, citizens of theUnited States, residing at Bridgeport, in the county of Fairfield andState of Connecticut, have invented certain new and useful Improvementsin Sewing-Machines, of which the following is a specification, referencebeing had therein to-the accompanying drawings.

This invention relates to improvements in sewing machines of the classemploying a needle-carrying bar having movements in different verticalplanes for effecting the ordinary straight-away seam and a seam composedof zigzag stitches of given or varying amplitude, and has for its objectto provide improved means for controlling the adjustment of theneedle-bar for effecting the seam desired.

Referring to the figures, Figure 1 is a front side elevation of a sewingmachine equipped with the invention, a portion of the bracket arm andbed-plate being broken away to illustrate more clearly the features inconstruction important to the invention. Fig. 2 an underside view of thesewing machine illustrated in Fig. 1, Fig. 3 a rear side elevation ofthe sewing machine shown in the previous figures, a portion of thebracket arm and bedplate being broken out to illustrate more clearly themeans employed for retarding and accelerating the rotary movements ofthe loop-taker to meet the requirements of the lateral movements of theneedle-bar, Figs. 4, 5 and 6 detail views, to be referred tohereinafter, and Fig. 7 comprises diagrammatic views of the seamseffected by the present construction.

As the invention relates mainly to the construction and application ofthe means for controlling the movements of the needlebar, only suchreference will be made to the other elements of the machine as is deemednecessary for a proper understanding of its application.

1 represents the bed-plateof the sewing machine upon which is mountedthe bracket arm comprising the arm bracket 2 and standard 3, 4c the mainor needle-bar-driving shaft provided at its rear end with a hand or bandwheel 5 and at its opposite end with a commonly-employed shaft flange(not shown) to which is pivotally connected the usualneedlebar-actuating link (not shown) operatively connected with theneedle-bar 6 carrying the eye-pointed needle 7, 8 and 9 theneedle-thread tension and take-up, respectively, 10 thecloth-presser-carrying bar and 11 the cloth-presser. The needle-carryingbar 6 is mounted to move vertically in the needle-bar-carrying frame 12pivoted at its upper end on a suitable stud bolt threaded into thebracket arm (as shown at 13), and 14 represents the presser-liftinglever. for moving the cloth-presser vertically to accommodate thepositioning of the fabric with respect to the line of needle actuation.

15 represents the feed-shaft mounted in suitable bearings formed at theunderside of the bed-plate and having formed integral with it thebearing lugs 16 and 17 into which is threaded the bolt 18 securedagainst ac cidental movement by a nut 20, and upon said bolt is pivoteda feed-dog-carrying bracket 21 provided with a feed-dog 22, the oppositeend of said shaft being connected by an arm 22 with a feed-connection 23I whose upper end embraces the usual feedconnection eccentric (notshown) carried by the main shaft, thus transmitting from said lastmentioned shaft feed movements to the feed-dog.

24 represents the feed-lift shaft mounted in the manner of the shaft 15and carrying at its forward end an arm 25 provided with a stud screw 26carrying a slide block 27 which engages the usual slot (not shown)formed in one end 28 of the lever 29, the latter forming a part of thefeed-dog-carrying bracket 21. The opposite end of said feed-lift shaftis connected by an arm 30 with a feed-lift connection 31 whose upper endembraces a feed-lift eccentric 32 carried by the main shaft, from whichlatter vertical movements are transmitted to the feed-dog.

33 represents a spiral gear carried by the main shaft, said gear meshingwith'a spiral gear 34 carried by a cam shaft 35 mounted at one end in abearing 36 formed in the On the cam shaft 35 is mounted aneedlevibratingcam 37 to be referred to hereinafter.

38 represents a-rotary loop-taker-aotuatin I ing shaft mounted insuitable bearings depending from the sewing machine bed-plate andcarrying at its forward end a spiral gear 39 which meshes with a likegear 40 (shown in dotted lines only, Fig. 1) secured on the rotaryloop-taker shaft 41, the

latter being mounted in the usual manner below said bed-plate. andcarrying a looptaker 42. Upon the rear end of the shaft 0 38 is secureda belt-driven pulley 43 operatively connected by a belt 44 with abeltdriving pulley 45 carried by the main shaft.

Said belt driving and driven pulleys are of the ratio'of two to one,thus giving to the loop-taker two rotations to one rotation of said mainshaft.

46 represents a sleeve loosely mounted on the shaft 38 and held againstlengthwise movement thereon by collars 47 and 48, said sleeve havingformed integral with it a b ear ing hub 49 upon which is pivoted one endof the loop-taker-actuating shaft link 50, the opposite end of said linkbeing pivotally attached to the lower end of the loop-takeractuatingshaft shifting lever 51 mounted to oscillate on a bearing stud 52secured in the standard 3 and pivotally connected at its upper end withthe shifting lever connection 53, which in turn is pivotally attached tothe .80 needle-carrying frame connection 54, for retarding andaccelerating the movements of the loop-taker. f a

' All of the foregoing parts are usually found in sewing mach nesof thepresent 85 class, and are herein'shownas best' representingone formofconstruction to which .;the"present invention'is applicable.

55 represents an oscillating shaft mounted in a bearing formed in thebracket arm, and to its outer endis adjustably secured by a screw 56 aneedle-bar-positioning arm 57 car-- rying at its freeend a springplunger 58 adapted to enter openings 59, 59' and 59" formed in thebracket 60 to hold said shaft against accidental axial movement, saidbracket being formed with a hollow hub 61 adjustably secured by screw 62on a hub 63 forming a part of the bearing for the shaft .55. The innerend of the shaft carries an 50' integrally formed crank arm 64 provided7 with .a bearing sleeve 65 in which is journaled an oscillating linkadjusting shaft 66 onthe inner end of which is secured, by

. I screw '67, oneend of a link 68, its opposite 66 end receiving athreaded bolt 69 securedby a .nut 70, and on said bolt is fulcrumed oneend of a link 71 whose opposite end is fulcrumed on a bolt 72 whichpasses through suitable bearings formed in the connections 60 54 and 53,amLis secured against lengthwise movement by the nut 73 and washer 74.

Upon the shaft 66 is suitably securedv a stop collar 75 providedwith-arms 76 and 77,

the arm 76 being connected by a link 78 with 66 an arm79 of a two-armlever 80 pivoted on a screw stud 81 threaded into the bracket arm, thearm 82 of said lever being connected with a rod 83 whose lower end isacted on by a suitable knee treadle (not shown) to rock the lever 80, atthe will of the operator, in the direction indicated by the arrow 2?. Aspring 84 acts on the bracket collar 85 secured on the shaft 66 to holdthe arm 77 normally in engagement with one of the registering screws 86,87 or 88, dependent upon the nature of the product required. As will beevident by reference to the drawings, the cam 37 imparts to the lever54- under all conditions equal vibratory movements on both sides of animaginary line connecting the shaft 35 with the pivot screw 89corresponding with the mean lateral position of said lever, and thecrank arms 64 and 68 are of substantially the same length as theswinging link 71. It therefore results that in any'of the positions ofthe angle lever 57-64, the rock-shaft 66, which positions spaced apartnot only lengthwise of such lever but upon opposite sides of its meanposition, thereby sustaining the fulcrum 69 in such manner that thelatter is permitted to assume its extreme maximum throw position coaxialwith the shaft 55 and in neutral position upon said imaginary line,between which extreme ositions it will so control the direction 0movement of the link 71 that its pivotal connection 72 with the lever 54will assume in each alternate movement one of its extreme positionscorresponding with the maximum throw of the needle.

, In Figs. 1, 2 and 3, the needle-bar-controlling mechanism is shown inposition to effeet the ordinary straight-away seam a arranged centralwith the amplitude of vibration of the needle, which is effected by anadjustment of the axis of the bolt 69 in line with the axis of the camshaft 35 and pivot screw 89, the positioning arm 57 occupying itscentral position as shown in Figs. 3 and 4 and the free end of the arm77 being in engagement with the registering screw 87. o eflect thezigzag seam b, the operator moves the rod 83 upward, which, through theconnecting elements 80, 78, 76, 66 and 68', causes theaxis of, the bolt69 to be moved out ofalinement with the axis of the shaft 35 and pivotscrew 89, and transmits to the connection 54 movements in the di--rection of its length and to the needle-bar lateral movements, it beingunderstood that the extent of lateral movement given the needle-bar iscontrolled by the extent of vertical movement given the rod 83, and thatthe adjustment of the latter is effected at the will of the operatorduring, and without retarding, the stitching operation.

To locate the seam c with respect to the like seam a as illustrated inFig. 7, the arm 57 is adjusted to register the spring-pressed plunger 58in the opening 59', which causes the shaft 66 to be moved toward thefront end of the machine sufficiently to bring the free end of the arm77 in engagement with the registering screw 88, thus positioning theneedle at the extreme left of its lateral movement, when the operator bymanipulating the rod 83 causes the needle-bar to be moved laterally andeffect the zigzag seam d in the same manner as the zigzag seam b. InFig. 5 the dotted lines represent the adjustment of the connection 54when stitching the seam a, and the full lines the adjustment of saidconnection when effecting the seam c. The seams e and f are effected inthe same manner as the seams c and vi, respectively, except that the arm57 is adjusted to register the plunger 58 in the opening 59", whichcauses the shaft 66 to move toward the rear end of the machinesufiiciently to bring the free end of the arm 77- into engagement withthe registering screw 86,

thus positioning the needle at the extreme right of its limit of lateralmovement, or for efi'ecting the seam e, when the operator bymanipulatiiig the rod 83 causes the needle- 40 bar to be movedlaterally, efiecting the seam f. In Fig. 6 the dotted line view of theconnection 54 represents the adjustment. of the latter when forming theseam e, and the full lines the adjustment of said connection whenefiecting the zigzag seam f.

What we claim is 1. The combination with a reciprocating and laterallymovable needle of a vibratory and endwise movable lever, connected withand adaptedto impart to said needle lateral movements, means forvibrating said lever, a swinging link pivotally connected with saidlever, a fulcrum for said link, means for moving said fulcrum in anarcuate path crosswise of said lever, and means for changing theposition of said arcuate path of movement relatively to said lever.

2. In a sewing machine, the combination with a main-shaft, a needlevibrating cam operatively connected with said shaft, a

said needle vibrating cam, of an oscillating shaft journaled inastationary part of the sewing machine provided with a needle-barpositioning arm and connections including a shaft-crank and linkslocated between said oscillating shaft and needle-bar carrying frameconnection for positioning the needle in different lateralstitch-forming positions.

3. In a needle-controlling mechanism for sewing machines, thecombination with a main shaft, a cam shaft provided with aneedle-vibrating cam, a laterally movable needle-bar-carrying frameprovided with a needle-carrying bar, a needle-bar-carrying frameconnection pivoted at one end to said needle-bar-carrying frame, itsopposite end being acted on by said needle-vibrating cam, and aneedle-bar-positioning arm, of connections includin links whose axes arenormally located III the same plane as the axes of said pivotedconnection and cam shaft for operatively connecting saidneedle-bar-positioning arm with said needle-bar-carrying frameconnection for controlling the stitchforming movements of saidneedle-bar in different lateral positions, dependent upon the nature ofthe product desired.

4. In a sewing machine, the combination with a main-shaft, aneedle-vibrating cam operatively connected with said shaft, a laterallymovable needle-bar carrying frame provided with a needle-carrying bar,and a needle-bar carrying frame connection pivoted at one end to saidneedle-bar carrying frame, its opposite end being acted on by saidneedle-vibrating cam, of an oscillating shaft held against accidentalmovement journaled in a stationary part of the sewing machine andprovided with a needle-bar positioning arm, and connections including ashaft crank and links located between said oscillating shaft andneedle-bar carrying frame connection for positioning the needle indifferent lateral stitch-forming positions.

5. In a sewing machine, the combination with a main-shaft, a needlevibrating cam operatively connected with said shaft, a laterally movableneedle-bar carrying frame provided with a needle-carrying bar, and aneedle-bar carrying frame connection pivoted at one end to saidneedle-bar carrying frame, its opposite end being acted on by saidneedle vibrating cam, of an oscillating shaft journaled in a stationarypart of the sewing machine, provided with a needle-bar positioning armand connections between said oscillating shaft and frame connectionincluding a crank-arm carried by said oscillating shaft and providedwith a bearing sleeve, a shaft journaled in said bearing sleeve, linksoperatively connecting said last named shaft with said frame connectionfor positioning the needle in different lateral stitch-formingpositions.

6. In a Sewing machine, the combination with a main-shaft, a needlevibrating cam operatively connected with said shaft, a laterally movableneedle-bar carrying frame provided with a needle-carrying bar, and aneedle-bar carrying frame connection pivoted atone side to saidneedle-bar carrying frame, its opposite end being acted on by saidneedle-vibrating cam, of an oscillating shaft journaled in a stationarypart of the sewing machine, a needle-bar positioning arm rigidly securedto said oscillating shaft, and connections between said oscillatingshaft and frame connection including links adjustable in directionslengthwise 'of said frame connection for positioning the needle indifferent lateral stitch-forming positions.

7. In a sewing machine, the combination with a main-shaft, a needlevibrating cam operatively connected with said shaft, a laterally movableneedle-bar carrying frame provided with a needle-carrying bar, and aneedle-bar carrying frame connection pivoted at one end to saidneedle-bar carrying frame, its opposite end being acted on by saidneedle vibrating cam, of an oscillating shaft journaled in a stationarypart of the sewing machine, and connections including a shaft crank anda shaft having movement about the axis of sald oscillating shaft forpositioning the needle in different lateral stitch-forming positions.

8. In a sewing machine, the combination with a main-shaft, a needlevibrating cam operatively connected with said shaft, a reciprocatingneedle carrying bar provided with a needle, connections between thelatter and said cam including a vibrating and endwise movable connectionfor transmitting to said needle lateral movements, of an oscillatingshaft journaled in a stationary part 'of the sewing machine and heldagainst accidental movement, and connections between said oscillatingshaft and vibrating and endwise movable connection including anoscillating shaft crank and swinging links operatively connectedtherewith and j ournaled at one end upon a single fulcrum havingswinging movements in directions corresponding to the vibratorymovements of said vibrating and endwise movable connection.

In testimony whereof, we have signed our names to this specification, inthe presence of two subscribin witnesses.

EORGE M. EAMES. JOHN S. FINCH. Witnesses:

STANLEY N. SMiTH,

ABBm M. DONIHEE.

